Sunday, Feb. 3 Monday, Feb. 4 - J-PARC

Transcription

The 12th Korea-Japan Meeting on Neutron Science
Univ. of the Ryukyus, Okinawa, Japan
Feb. 3-6 , 2013
Sunday, Feb. 3
15:00
17:00
Registration (Hotel Ocean)
Get Together
-
Monday, Feb. 4
09:00
09:20
-
09:20
09:30
09:30
-
10:00
10:00
-
10:20
10:35
-
10:55
10:55
-
11:15
11:15
-
11:35
11:35
-
11:55
11:55
12:10
-
12:10
13:30
13:30
-
13:55
13:55
-
14:20
14:20
-
14:45
15:00
-
15:25
15:25
-
15:50
15:50
-
16:15
16:15
-
17:30
Registration (U. of Ryukyus)
Opening
Plenary Talk
Being and Non-being
Chair: Ki Bong Lee
Prof. Susumu Ikeda
(KEK)
Facility Report
Yasuhiko Fujii
Promotion of Public Utilization of Large Facilities for Small (CROSS-Tokai)
Science
Coffee Break (15min)
Facility Report (cont’d)
Chair: Yasuo Endo
Present status of J-PARC
Masatoshi Arai
(JAEA/J-PARC)
Growing Neutron Science and Facility at HANARO
Kye Hong Lee
(KAERI)
Neutron Research Activity in KURRI
Yuji Kawabata
(Kyoto Univ.)
Current Status of JRR-3 and its Engineering
Hiroshi Suzuki
(JAEA)
Photo Session
Lunch/Business Meeting
Instrumentation I
Chair: Je Geun Park
Powder Diffraction for Materials Research
Takashi Kamiyama
(KEK)
The current status and recent results of iMATERIA
Toru Ishigaki
(Ibaraki Univ.)
IBARAKI Biological Crystal Diffractometer (iBIX) at J-PARC
Ichiro Tanaka
(Ibaraki Univ)
Hard Matter
Chair: Shinichi Itoh
Common understanding of magnetoelectricity in various
Jae-Ho Chung
types of hexaferrites
(Korea Univ.)
Structural distortion driven by quadrupole ordering of
Kun-Pyo Hong
PrB6
(IBS, CFICES, SNU)
Spin dynamics of room-temperature multiferroic BiFeO3
Jaehong Jeong
(Seoul National Univ.)
Poster Session
Banquet (Ryukyu Style Restaurant)
Feb. 3-6 , 2013
Tuesday, Feb. 5
Instrumentation II
09:00
-
09:25
09:25
-
09:50
09:50
-
10:05
10:20
-
10:45
10:45
-
11:10
11:10
-
11:35
11:35
-
12:00
12:00
-
13:30
13:30
-
13:55
13:55
-
14:20
14:20
-
14:45
15:00
-
15:25
15:25
-
15:50
15:50
-
16:15
16:15
-
16:40
16:40
-
17:05
Wide and Small Angle Neutron Scattering for the Study of
Engineering Materials
Neutron Brillouin Scattering on HRC
The first result of the disk chopper time-of-flight
spectrometer DC-ToF at HANARO
Soft Matter
Neutron Studies on the Stimuli-Triggered Structural
Changes in Functional Polymer Platforms
Periodic distribution of ions confirmed by contrast
matching small-angle neutron scattering in water, organic
solvent, and salts
Neutron Reflectivity Study of Thin Film Polymer
Multilayers in Supercritical Carbon Dioxide
Small Angle Neutron Scattering Study of Phase Behaviors
of Amphiphilic Molecules in Aqueous Solution
Lunch
Instrumentation III
Current Status of the Si Crystal Analyzer near
Backscattering TOF Spectrometer DNA in a Spallation
Neutron Source at J-PARC
Polarized 3He neutron spin filter - development and
application
Nuclear Data Measurements using the ANNRI in JPARC/MLF
Nano/Industry
Current status and activity on Engineering Materials
In situ neutron diffraction scattering study of thermal
decomposition of LiBH4 mixed with modified MWCNT
New iron-based mixed-polyanion cathodes for lithium and
sodium rechargeable batteries: Combined first principles
calculations and experimental study
Investigation of Hydrogen Storage Mechanism in nanoporous materials by in-situ neutron scattering
Small Angle Neutron Scattering Study of Nano Sized
Microstructure in Ferrous Alloys
Closing
Farewell Dinner
Chair: Takashi
Kamiyama
Baek-Seok Seong
(KAERI)
Shinichi Itoh
(KEK)
Ji-Yong So
(KAERI)
Chair: Ichiro Tanaka
Kookheon Char
Koichiro Sadakane
(KEK)
Jaseung Koo
(KAERI)
Tae-Hwan Kim
(KAERI)
Chair: Jae-Ho Chung
Nobuaki Takahashi
(JAEA/J-PARC)
Takashi Ino
(KEK)
Atsushi Kimura
(JAEA)
Chair: Han Ki Yoon
Jun Abe
(JAEA)
In Hwa Cho
(KAERI)
Kisuk Kang
Yong Nam Choi
(KAERI)
Young-Soo Han
(KAERI)
Feb. 3-6 , 2013
Oral Presentation
OP01
OF01
OF02
OF03
OF04
OF05
OI01
OI02
OI03
OI04
OI05
OI06
OI07
OI08
OI09
OH01
OH02
OH03
OS01
Plenary Talk
Being and Non-being
Susumu Ikeda, KEK
Facility Report
Promotion of Public Utilization of Large Facilities for Small Science
Yasuhiko Fujii, CROSS-Tokai
Present status of J-PARC
Masatoshi Aari, JAEA/J-PARC
Kye Hong Lee, KAERI
Yuji Kawabata, Kyoto University
Current Status of JRR-3 and its Engineering
Hiroshi Suzuki, JAEA
Instrumentation
Powder Diffraction for Materials Research
Takashi Kamiyama, KEK
Toru Ishigaki, Ibaraki University
Ichiro Tanaka, Ibaraki University
Wide and Small Angle Neutron Scattering for the Study of Engineering Materials
Baek-Seok Seong, KAERI
Shinichi Itoh, KEK
The first result of the disk chopper time-of-flight spectrometer DC-ToF at HANARO
Ji-Yong So, KAERI
Current Status of the Si Crystal Analyzer near Backscattering TOF Spectrometer DNA in a
Spallation Neutron Source at J-PARC
Nobuaki Takahashi, JAEA/J-PARC
Polarized 3He neutron spin filter - development and application
Takashi Ino, KEK
Nuclear Data Measurements using the ANNRI in J-PARC/MLF
Atsushi Kimura, JAEA
Hard Matter
Common understanding of magnetoelectricity in various types of hexaferrites
Jae-Ho Chung, Korea University
Structural distortion driven by quadrupole ordering of PrB6
Kun-Pyo Hong, IBS, CFICES, SNU
Jaehong Jeong, Seoul National University
Soft Matter
Neutron Studies on the Stimuli-Triggered Structural Changes in Functional Polymer
Platforms
Koookheon Char, Seoul National University
Page
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
OS02
OS03
OS04
ON01
ON02
ON03
ON04
ON05
Feb. 3-6 , 2013
Periodic distribution of ions confirmed by contrast matching small-angle neutron
scattering in water, organic solvent, and salts
Koichiro Sadakane, KEK
Neutron Reflectivity Study of Thin Film Polymer Multilayers in Supercritical Carbon
Dioxide
Jaseung Koo, KAERI
Small Angle Neutron Scattering Study of Phase Behaviors of Amphiphilic Molecules in
Aqueous Solution
Tae-Hwan Kim, KAERI
Nano/Industry
Investigation of Hydrogen Storage Mechanism in nano-porous materials by in-situ
neutron scattering
Yong Nam Choi, KAERI
In situ neutron diffraction scattering study of thermal decomposition of LiBH4 mixed
with modified MWCNT
In Hwa Cho, KAERI
New iron-based mixed-polyanion cathodes for lithium and sodium rechargeable
batteries: Combined first principles calculations and experimental study
Kisuk Kang, Seoul National University
Current status and activity on Engineering Materials
Jun Abe, JAEA
Small Angle Neutron Scattering Study of Nano Sized Microstructure in Ferrous Alloys
Young-Soo Han, KAERI
20
21
22
23
24
25
26
27
Poster Presentation
PI01
PI02
PI03
PI04
PI05
PI06
PI07
PI08
PI09
Instrumentation
Universal Event Recording DAQ System in J-PARC/MLF
Takeshi Nakatani, J-PARC
Development of New Special Environment Powder Neutron Diffractometer, SPICA
Masao Yonemura, KEK
Development of New Rietveld Code as Powder Diffraction Analysis Suite, Z-Code
Masao Yonemura, KEK
Current Status of Extreme Environment Single Crystal Neutron Diffractometer SENJU at JPARC
Takashi Ohhara, CROSS-Tokai
Development of neutron TOF measurement system using an image intensifier and a high
speed camera
Hiroki Ueno, Hokkaido University
Numerical study of MAGIC chopper performance by Monte Carlo simulation
Kazuhiko Ikeuchi, CROSS-Tokai
A Cold-Neutron Disk Chopper Spectrometer, AMATERAS
Tetsuya Kikuchi, J-PARC
Current Status of the Small and Wide Angle Neutron Scattering Instrument (TAIKAN) of JPARC
Shin-ichi Takata, JAEA
Present Status of a New Pulsed Neutron Imaging Instrument at J-PARC
Mariko Segawa, J-PARC
28
29
30
31
32
34
35
36
37
PI10
PI11
PS01
PS02
PS03
PS04
PS05
PS06
PS07
PH01
PH02
PH03
PH04
PH05
Feb. 3-6 , 2013
Current Status of a newly developed Polarized Neutron Reflectometer (Sharaku) at
bemaline BL 17 of J-PARC
Kubota Masato, JAEA
Quantitative evaluation of nuclide density distribution in a substance using the neutron
resonance absorption spectroscopy at J-PARC/MLF/BL10
Hiroyuki Hasemi, Hokkaido University
Soft Matter
NR Studies on the Stimuli-Triggered Changes in Polymer Thin Films with Different MWs
Yeongseon Jang & Hyunjoo Son, Chem&Bio.Eng., SNU
SANS Studies on the Effect of Additives on the Morphology of Organic Solar Cells
Jongkuk Ko, Chem&Bio.Eng., SNU
Dynamics of PEO Chain in Micro-phase Separated Structure Formed by Liquid-crystal
Amphiphilic Di-block Copolymer
Takeshi Yamada, CROSS-Tokai
Chain dimension of ring polystyrenes in solutions studied by SANS
Hiroki Sawaki, Nagoya Univ.
Chain dimension of ring polystyrenes in bulk studied by SANS
Yuki Kobayashi, Nagoya Univ.
Calculation of Space-time Correlation Function on Liquid Benzene by using MEM
Tetsuya Kikuchi, J-PARC
Moisture effect on Double network polymers using J-PARC/TAIKAN(BL15)
Taiki Tominaga, J-PARC
Hard Matter
Study of direct relations between the spiral spin ordering and electric polarization in
Mn1-xCoxWO4
Young-Sang SONG, Dept. of Physics, Korea University
Heliconical magnetic ordering and field-induced electric polarization in Zn2Y and Co2Y
hexaferrites
Hak Bong Lee, Dept. of Physics, Korea University
Sinlge Crystal Neutron Diffraction of Magnetoelectric Co2Z hexaferrite
Hun Chang, Dept. of Physics, Korea University
Neutron scattering studies in non-centrosymmetric superconductors CeTSi3 (T=Rh,Ir)
Naofumi Aso, Univ. of the Ryukyus
Structure of SiO2-GeO2 glasses by J-PARC NOVA
Kentaro Suzuya, JAEA
38
39
41
42
43
44
45
46
47
48
49
50
51
52
Feb. 3-6 , 2013
Oral-OP01
Being and Non-being
S. Ikeda
High Energy Accelerator Research Organization, Tsukuba, Japan
Email: susumu.ikeda@kek.jp
The first small Korea-Japan meeting was held at KEK with invitation of two Korean
scientists and several Japanese scientists. The purpose was to establish fruitful
collaboration in neutron science between both countries. Ever since eleven meetings have
been held in Korea- and Japan-sites, and developed many friendly collaboration as well as
grown up many young scientists. This attempt was a great success as the first stage. Now a
day, other techniques as light sources are developing much quickly. Therefore, it is always
expected that neutron methods and technologies should be innovated toward the new
science fields, and that advantages of neutron techniques can be claimed more strongly
and clearly, comparing with other techniques ’abilities. It also means that the existing or
non-existing of neutron science itself should be considered again from the beginnings at
all times. For such great innovation, the second stage should beplaned under the strong
collaboration of Korea and Japan.
1
Feb. 3-6 , 2013
Oral-OF01
Promotion of Public Utilization of Large Facilities for Small Science
Y. Fujii
Research Center for Neutron Science and Technology (CROSS-Tokai)
Comprehensive Research Organization for Science and Society
c/o IQBRC, 162-1 Shirakata, Tokai, Ibaraki 319-1109, Japan
Email: y_fujii@cross.or.jp
Neutron scattering and synchrotron radiation researches are categorized into “Small
Science”, which can be conducted by a small number of researchers/students, even by a
single person. However, it requires such a “Large Facility” as nuclear reactor or
accelerator, which costs a large amount of taxpayers’ money not only for construction but
also for operation. On the other hand, the nuclear or high-energy physics experiment is
conducted by a large number of researchers with their common purpose, for example, to
discover an unknown particle based on a large scale facility. This is called “Large Science
at Large Facility” in contrast to “Small Science at Large Facility”.
The “Small Science at Large Facility” covers a wide variety of research fields ranging
from basic/applied research to industrial/medical application; therefore, it plays a central
role in promoting science and technology in the nation. For such a purpose it is essentially
important to secure a stable and reliable operation of the Large Facility for Small Science.
The Japanese Government recently introduced the Legislation for the “Promotion of
Public Utilization of Specific Advanced Large Research Facilities”, which has been
successfully applied to the neutron facility of J-PARC/MLF, the synchrotoron/X-FEL
facility at SPring-8/SACLA, and the super-computer facility at K-Computer. This
legislation requires that at the "Specific Neutron Beam Facility", an independent thirdparty organization (known as the "Registered Institution") should manage and execute the
activities associated with the selection of research proposals for, and the support of user
experiments on the public beamlines in preference to the original builder and installer of
these facilities (JAEA). Similarly, the role of the Registered Institution will include also
activities associated with the selection and implementation of proposals to build contract
beamlines put forward by other organizations and with a periodic review of their activities
after the construction .
CROSS-Tokai was selected by the Ministry for Education, Culture, Sports, Science and
Technology (MEXT) as the "Registered Institution" for this purpose and formally
appointed by the Minister on the 22nd of March, 2011. Accordingly, on the 1st of April,
2011, CROSS-Tokai assumed this role and began operations at its offices within the JAEA
precinct. Thus this legislation secures the operation of the Specific Advanced Large
Research Facility after its construction with respect to its finance and man power.
2
Feb. 3-6 , 2013
Oral-OF02
Status Report of J-PARC MLF
(The Materials & Life Science Experimental Facility)
M. Arai
Materials and Life Science Division, J-PARC Center, Tokai, Japan
Email: masatoshi.arai@j-parc.jp
J-PARC MLF was designed to be a 1 MW spallation neutron source. The averaged
neutron flux is about 1/4 of ILL research reactor. However, the pulse peak flux can exceed
100 times that of ILL. This factor gives new paradigm for neutron scattering not only in
basic science but also in application such as industrial use of neutrons. Present power of
the proton accelerator is 300 kW with a very stable operation, 94% world-level stability,
after recovering from the devastating disaster happened in March two years ago.
Therefore users have enjoyed their experiments very much. It is planned to increase the
power to be 400 kW after the summer shutdown, when we will upgrade accelerator. 20
instruments have been already funded, 16 are available for user program and four
instruments are under either commissioning or construction. Operational time for user
program in 2012 is about 180 days, and we have received more than 550 experimental
proposals from users. World-class scientific outputs have been already created in various
scientific fields, ranging from Li-battery science to bio-molecular science. Since J-PARC
is internationally open for users, we have got experimental proposals from abroad more
than 10% of the whole proposals. More than 30% of proposals have come from industries,
such as Toyota, Nissan, Honda, Panasonic and other big industries. This fact has revealed
a new horizon come in the neutron scattering science in the 21 century. We are expecting
those statistics will increase more than three times at 1MW in three to four years time.
In my talk, I will describe not only on current status of J-PARC MLF neutron source
but performance of instruments and scientific topics.
3
Feb. 3-6 , 2013
Oral-OF03
K. H. Lee
Korea Atomic Energy Research Institute, Daejeon, Korea
Email: khlee@kaeri.re.kr
Three more cold neutron instruments, REF-V, DC-ToF, and USANS, have been open
to users in 2012 following two SANS’ open in 2010. In 2013, 2 thermal neutron
instruments, Bio-D and Bio-C and cold TAS, cold neutron PGAA and Neutron Depth
Profiling will be open to users. 17 neutron instruments will be running in the reactor hall
and guide hall at the end of 2013. The number of users in 2011 was 500 and it will be
increasing as more neutron instruments are open and the reactor operation becomes stable.
It is very encouraging that Institute for Basic Science included neutron science as one
of its research centers. Currently, there are 280 members in Korea Neutron Beam Users
Association, but the neutron community will obviously grow as more research fund is put
into this research area through IBS.
What is not in a sound situation is a user program, through which more advancement
and improvement of the instruments and sample environment should be performed and
more instrument scientists and engineering support staff should be secured.
4
Feb. 3-6 , 2013
Oral-OF04
J.Kawabata
Research Reactor Institute, Kyoto Univ., Kumatori, Osaka, Japan
Email: kawabata@rri.kyoto-u.ac.jp
KUR has been operated without any problem though we had a very big earthquake and
Fukushima accident in 2011. It is the only MW class research reactor operated in Japan
now. The number of proposals for KUR experiment are recovered after the 4 years(2006
spring - 2010 Spring) interruption for the fuel conversion.
The accelerator-driven system (ADS) using the complex of a Fixed Field Alternating
Gradient (FFAG) proton accelerator and Kyoto Univ. Critical Assembly (KUCA) is also
operated constantly for nuclear physics experiments. A BNCT facility with a cyclotron
base neutron source was installed in 2008 and the clinical trials for the
human therapy started in October 2012 after a long commissioning and animal trials.
Cyclotron Based Epithermal Neutron Source for BNCT
5
Feb. 3-6 , 2013
Oral-OF05
Current Status of JRR-3 and its Engineering Diffractometers
H. Suzuki, S. Wakimoto, H. Matsue, M. Shibayama1) and K. Kakurai
Japan Atomic Energy Agency, Tokai, Japan, 1) The University of Tokyo, Tokai, Japan
Email: suzuki.hiroshi07@jaea.go.jp
Instruments in the JRR-3 have been continuously upgraded, and produced many
interesting results in research fields of materials and life science under the National
Universities’ Users Program and the JAEA User Program. Recently, many users from
industries come to use neutrons for their researches and developments. Especially the
neutron engineering diffractometers, RESA-1 and RESA-2, are often utilized for
measuring residual stresses as well as for evaluating materials strengths in their
products. However, the JRR-3 has been out of service for a long time due to the
earthquake occurred on March 11th, 2011. First of all, we would like to acknowledge
neutron facilities abroad including the HANARO and neutron colleagues for many
offers of acceptance of JRR-3 proposals after the earthquake.
The damage of instruments in the JRR-3 due to the earthquake was not so serious, so
fortunately they have already been recovered from the disaster. However, lost alignment in
neutron guide tubes estimates about 85% neutron flux of before the disaster after the
realignment. Meanwhile, we have undertaken not only recovery but also improvement,
e.g., replacing the cold neutron guides, C1 and C3 lines, with the supermirror guide tube
for increasing their neutron flux. The JRR-3 has not restarted yet, but all instruments are
ready to accept the neutrons. On the other hand, the JRR-3 Users Office was started in
Apr., 2010 to provide user supports for 18 instruments owned by the JAEA. They have
recently worked to improve the user-interface like establishments of the JRR-3
publication database and the new proposal application system, RING [1], by organizing
some working groups. Furthermore, they have dedicated their efforts to
internationalization for accepting international users in near future, e.g., building the JRR3 facility homepage [2] and the Users Office homepage [3] in English.
In this presentation, we will introduce current status of the JRR-3 after the earthquake
including present user support system as well as some research topics especially in
neutron engineering diffraction.
[1] RING: https://jrr3ring.jaea.go.jp/index.php (in Japanese only)
[2] JRR-3 facility homepage: http://jrr3.jaea.go.jp/jrr3e/index.htm
[3] JRR-3 Users Office homepage: http://jrr3uo.jaea.go.jp/jrr3uoe/index.htm
6
Feb. 3-6 , 2013
Oral-OI01
Neutron Powder Diffraction for Materials Research
Takashi KAMIYAMA, Masao YONEMURA, Shuki TORII, Ryoko TOMIYASU, Yoshihisa
ISHIKAWA
High Energy Accelerator Research Organization (KEK), Tsukuba, Japan
E-mail: takashi.kamiyama@kek.jp
MLF (Materials and Life Science Facility) of J-PARC has six neutron powder
diffractometers (NPD’s) with different resolution, intensities, and apparatuses for pursuing
different research subjects. All NPD’s have the potential to explore the science regions
not possible with conventional NPD. SuperHRPD is the highest resolution NPD and is
able to detect tiny structural change during phase transition, and to determine crystal
structures of complex materials of interest. Various in situ studies and/or real time studies
of functional materials is more and more important in materials research, and NOVA (a
high intensity total diffractometer) and SPICA (a special environment diffractometer) will
contribute to the studies of hydrogen absorptions/desorptions, charge/discharge processes,
chemical reactions, syntheses, etc. We will show some examples.
7
Feb. 3-6 , 2013
Oral-OI02
Toru Ishigaki,
Akinori Hoshikawa, Kenji Iwase, Dyah. S. Adipranoto
iFRC, Ibaraki University, Tokai, Japan
Email: toru.ishigaki@j-parc.jp
iMATERIA (IBARAKI Materials Design Diffractometer) is a high throughput-versatile
neutron diffractometer in J-PARC, build by Ibaraki prefecture, the local government of the
area where J-PARC sites. It covers the d in range 0.18 < d (Å) < 5 with d/d = 0.16 % at
high resolution bank, and 5 < d (Å) < 40 with the resolution changing gradually at two
detector banks of 90 degree, and low angle. So, this diffractometer covers very wide drange (0.18 < d (Å) < 40). If the small angle detector bank will be available, which is
currently under commissioning, iMATERIA will cover wider d-range (0.18 < d (Å) < 800).
It takes several minutes to obtain a ”Rietveld-quality” data for the X-ray laboratory sized
sample measured at 1MW. Currently, the beam power is limited for tuning the accelerator
( 300kW), so that the measuring time is about 15 to 30 min for standard oxide
samples.The automatic sample changer system [2] is most important sample environment
for high throughput experiments. The automatic sample changer system consisted of large
number of sample storage and two lines of elevating system, pre-vacuum chambers and
sample rotating ta- bles. So, this we c an handle more than 600 samples continuously at
room temperature without breaking a vacuum of sample chamber. Another standalone
sample changer and the cryofurnace with sample changer are also prepared. The analysis
software is also very important for powder diffraction data; so that we prepare several
powder-diffraction software, include Rietveld analysis software (Z-Rietveld [3,4]) and
Maxmum Entropy Method software (Z-MEM).The current status of iMATERIA and the
recent data, include the challenge for measurement of small amount of sample and organic
samples will be reported.
Fig.1 IBARAKI Materials Design Diffractometer, iMATERIA.
[1] T. Ishigaki et. al., Nucl. Instr. Meth. Phys. Res. A, 600, 189-191 (2009).
[2] A. Hoshikawa et. al., J. Phys.: Conf. Ser. 251 012083 (2010)
[3] R. Oishi, et. al., Nuclear Instruments and Methods A 600, 94-96 (2009).
[4] R. Oishi-Tomiyasu, , et. al., J. Appl. Cryst. 45, 299-308 (2012).
8
Feb. 3-6 , 2013
Oral-OI03
I. Tanaka AB, K. Kusaka B, T. Yamada B, T. Hosoya AB, K. Tomoyori B, T. Ohhara C, K.
Kurihara D, M. Katagiri B, N. Niimura B
A
B
C
Ibaraki University, Hitachi, Japan Ibaraki University, Tokai, Japan CROSS, Tokai, Japan
D
JAEA, Tokai, Japan
Email: i.tanaka@mx.ibaraki.ac.jp
Hydrogen, protonation and hydration play important roles in various life processes at
the atomic level. In order to study them, a new diffractometer for neutron protein
crystallography, IBARAKI Biological Crystal Diffractometer (iBIX), has been constructed
at BL03 in the 1st experimental hall of MLF in J-PARC and operational since December
2008[1].
Because of little damage due to the 3.11 big earthquake in 2011, iBIX could start
without large troubles. Just before the earthquake, iBIX has succeeded in collecting two
data sets; an Alzheimer’s disease-related protein and an organic compound with Pb and Br,
and their structure analysis results were published in the last year[2, 3].
In the last summer, 16 new detectors were installed and the old 14 detectors were
updated to the new system completely so that the iBIX measurement efficiency becomes 3
to 5 times larger than the previous one.
Since autumn of 2012, the J-PARC accelerator power has become 300kW from 200kW.
In December 2012, the commissioning and the adjustment of all detectors have almost
finished, so iBIX is now expected as one of the highest performance of a single crystal
neutron diffractometer in the world.
As recent results, several organic compounds’ analyses have finished and test
measurements of several proteins have also finished and taking the full data set of them
has been on schedule.
References
[1] I. Tanaka, et al., Acta Cryst. D 66, 1194 (2010).
[2] T. Yokoyama, et al., J. Struct. Biol., 177 (2012) 283.
[3] T. Kawasaki, et al., J. Phys. Soc. Jpn. 81 (2012) 094602.
ACKNOWLEDGEMENT: The authors thank the Department of planning of Ibaraki
Prefectural Government for its sponsorship.
9
Feb. 3-6 , 2013
Oral-OI04
Wide and Small Angle Neutron Scattering for the Study of Engineering
Materials
Baek-Seok SeongA*, Apichate ManeewongA,B, Eunjoo ShinA, Young-Soo HanA,
Wan Chuck WooA, Kye Hong LeeA
A) Neutron Science Division, Korea Atomic Energy Research Institute,
1045 Daedeok-daero, Yuseong-gu, Daejeon, 305-353, Korea
B) University of Science & Technology,
217 Gajeong-ro, Yuseong-gu, Daejeon, 305-350, Korea
Fax: +82 – (42) 868 -8442, E-mail Address: bsseong@kaeri.re.kr
Small angle neutron scattering (SANS) and neutron powder diffraction techniques are
very powerful tools in determining the size distribution of precipitates and the volume
fraction of multi-phases in high strength steels used for automobile bodies. Neutrons make
it possible to measure non-destructively in bulk sample with various sample environments
such as furnaces, loading devices, cryostats, pressure cells and magnetic fields. In some
cases, X-ray, TEM and APT are complementarily used to get the local information in the
sample. In this presentation, the quantitative analysis methods of nano-sized precipitates in
low carbon steel, the solute carbon content in austenite of TRIP steels, and the partitioning
of the martensite phase induced by thermal and mechanical process by neutron scattering
techniques performed at HANARO will be introduced.
10
Feb. 3-6 , 2013
Oral-OI05
S. ItohA , T. YokooA , D. KawanaA and Y. EndohA,B
a
Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba
305-0801, Japan
2
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Email: shinichi.itoh@kek.jp
Inelastic neutron scattering is a powerful tool for observing coherent excitations in
condensed matters. For a single crystalline sample, the dynamical structure factor of the
coherent excitations such as magnons and phonons are easily observed by choosing the
scattering condition. Contrary to this, measurements of magnetic excitations by using a
polycrystalline sample are rather difficult, even though a single crystalline sample is not
always synthesized in an early stage of a study in some cases. Scattering intensities of
ferromagnetic spin waves from a polycrystalline sample rapidly decrease as the
scattering vector increases from (000) due to the powder average of the dynamical
structure factor. It is difficult to access the energy momentum space near (000) and to
perform so-called neutron Brillouin scattering (NBS) experiments due to the kinematic
constrain of the neutron. To access the energy momentum space close to (000) by an
inelastic neutron scattering experiment, neutrons with an energy of sub-eV or higher (incident neutron energy, Ei ) should be incident up on the sample and scattered neutrons
should be detected at scattering angles of 1◦ or less with high energy resolution of ∆E /Ei
being a couple of percent or less.
We here demonstrate NBS experiments on the High Resolution Chopper Spectrometer
(HRC) installed at the Material and Life Science Facility (MLF) in Japan Proton
Accelerator Research Complex (J-PARC) [1]. The feasibility of NBS on the HRC was
demonstrated by observing ferromagnetic spin waves in La0.8 Sr0.2 MnO3 and SrRuO3
polycrystals. Gapless spin-wave excitations were observed in La0.8 Sr0.2 MnO3 , which
were in good agreement with previous results using single crystals [2,3]. The novel result
is a well-defined quadratic Q dependence in the spin-wave dispersion curve with a large
energy gap in SrRuO3. We tried to perform preliminary NBS experiments on a
polycristalline sample of a permanent magnet Nd2Fe14B. The spin wave intensities were
observed at (Q,E) consistent with previous results using single crystals [4]. Also, we
performed NBS experiments on liquid D2O. The observed spectra were in good agreement
with previous results [5].
[1] S. Itoh, et al., Nucl. Instrum. Meth. Phys. Res. A631, 90 (2011).
[2] Y. Endoh and K. Hirota, J. Phys. Soc. Jpn. 66, 2264 (1997).
[3] F. Moussa, et al., Phys. Rev. B 76, 064403 (2007).
[4] et al., J. Magn. Magn. Mater 97, 210 (1991).
[5] et al., Phys. Rev. Lett. 54, 2681 (1985).
Acknowlegement: This neutron scattering experiment was approved by the Neutron Scattering
Program Advisory Committee of the Institute of Materials Structure Science, High Energy
Accelerator Research Organization (Proposal Nos. 2011S01 and 2012S01). We are grateful to Y.
Kaneko, Y. Tokura, M. Fujita, and K. Yoshida for sample preparations, and to K. Ono and J. G.
Park for fruitful discussions. This work was partially supported by Grant-in-Aids for Scientific
Research from the Japanese Ministry of Education, Culture, Sports, Science and Technology.
11
Feb. 3-6 , 2013
Oral-OI06
The First Result of The Disk Chopper Time-of-Flight Neutron
Spectrometer DC-ToF at HANARO
Ji-Yong So and Eun-Hye Kim
Email:jiyongso@kaeri.re.kr
The Disk Chopper Time-of-Flight Spectrometer (DC-ToF) is an inelastic neutron timeof-flight spectrometer using multi-disk choppers and long position sensitive detectors
(PSDs) at the HANARO research reactor. The DC-ToF has been developed since 2003
and the first neutrons were observed in Mar. 2012. Since then, the commissioning of the
DC-ToF has been taken. This presentation is intended to describe the instrumental
specification and performance of the spectrometer. In addition, the first measurement
results of standard samples and other samples will be reported.
12
Feb. 3-6 , 2013
Oral-OI07
Current Status of the Si Crystal Analyzer near Backscattering TOF
Spectrometer DNA in a Spallation Neutron Source at J- PARC
N. Takahashi, K. ShibataA, T. YamadaA, K. KamazawaA, Y. Kawakita, K. Nakajima,
W.Kambara, Y. Inamura, T. Nakatani, K. Aizawa, M. Arai, K. Soyama, H. Tanaka, T.
Iwahashi, Y. Ito, T. Hosoya, Y. Yamauchi, S. FujiwaraB, T. J. SatoC, F. Mezei D, H. MutkaE
and D. neumannF
J-PARC Center, JAEA, J apan
A
CROSS-Tokai, Japan
B
C
QuBS, JAEA, Japan
IMRAM, Tohoku Univ., Japan
D
BNC, Budapest, Hungary
E
ILL, Grenoble, France
F
NCNR, NIST, USA
Email: nobuaki.takahashi@j-parc.jp
A Si crystal analyzer near backscattering spectrometer DNA [1] which covers the area
of the micro-eV energy range in the Q-E space, where it is expected to explore sciences
on atomic, molecular and spin dynamics in the nanosecond time range has been
installed at BL02 of the Materials and Life Science Experimental Facility (MLF) of the
Japan Proton Accelerator Research Complex (J-PARC) until at the end of February
2012.
Then, various on-beam commissioning has been done for about a year with
handling continuing user program. In this report, we will introduce specifications, current
status of the instrument.
[1] N. Takahashi, K. Shibata, T.J. Sato, I. Tamura, R. Kajimoto, S. Harjo, K. Oikawa, M.
Arai, and F. Mezei, Journal of Physics and Chemistry of Solids 68, 2199 (2007).
13
Feb. 3-6 , 2013
Oral-OI08
Polarized 3He neutron spin filter in J-PARC development and
application
Takashi Ino
KEK, Tsukuba, Japan
Email: takashi.ino@kek.jp
The spin-dependent neutron absorption cross section of 3He nuclei is large enough to
realize neutron spin filters (NSFs) from cold to epithermal neutrons with spin-polarized
3
He gas. Such polarized 3He NSFs are now promising tools for polarized neutron
scattering measurements thanks to various technological advances which have improved
the 3He polarization as well as the polarized 3He gas volume.
The nuclear polarization of 3He can be achieved by the optical pumping method. The
spin-exchange optical pumping (SEOP), in which alkali metal atoms are first polarized
through the optical pumping, then their atomic polarization are transferred to 3He nuclei,
and the metastability-exchange optical pumping (MEOP), in which the polarization of
metastable helium atoms is achieved and then exchanged with that of the 3He nuclei, are
two popular methods. Each has advantages and disadvantages, but the achieved 3He
nuclear polarizations are essentially the same.
Recent technological developments of 3He neutron spin filters and application in JPARC will be presented.
14
Feb. 3-6 , 2013
Oral-OI09
Nuclear Data Measurements using the ANNRI in J-PARC/MLF
A,Kimura
Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency
Email: kimura.atsushi04@jaea.go.jp
Accurate neutron capture cross section data for minor actinides (MAs) and long-lived
fission products (LLFPs) are required to estimate the production and transmutation rates
for developing innovative nuclear systems. However, accurate measurements of these
cross sections are very difficult due to high radioactivity of these samples. To satisfy the
requirement, Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI)
has been developed in the MLF of the J-PARC. A series of neutron capture crosssection measurements have been started with the ANNRI.
There are two spectrometers in the ANNRI. One is a large germanium detectors array
at the flight length of 21.5 m and the other one is a NaI spectrometer at the flight length of
28 m. Using the spectrometers with a neutron time-of-flight method, both energy of
neutrons and prompt-γ rays are measured at the same time. The energy-integrated neutron
intensities at the flight length of 21.5 m are 1.2×107n/s/cm2 in the neutron energy
range of 1.5-25 meV, and 1.8×106n/s/cm2 in 0.9-1.1 keV at a beam power of 300 kW.
In the epithermal energy region, the energy-integrated neutron intensity is more than
10 times as high as the values of the other instruments. Moreover, under the future 1MW operation, these intensities are expected to increase to 4.3×107, and 6.3×106
n/s/cm2, respectively.
Currently, analyses of 244Cm, 246Cm and 237Np have been finished, and analyses of
241
Am, 129I, 107Pd, 99Tc and 93Zr are in progress. These results will make significant
contributions in the field of developing innovative nuclear systems. Furthermore, using
strong pulsed neutrons, the ANNRI has been used not only for nuclear data but also
nuclear astrophysics and microanalysis.
ACKNOWLEDGEMENT: This work is partly supported by JSPS KAKENHI (22226016
and 22760675)
15
Feb. 3-6 , 2013
Oral-OH01
Common understanding of magnetoelectricity in various types of
hexaferrites
J.-H. Chung
Dept. of Physics, Korea University, Seoul, South Korea
Email: jaehc@korea.ac.kr
In magnetoelectric multiferroics, electric polarizations can establish without ionic
displacements via spin-orbit coupling that involves spin moments with noncollinear spatial
arrangements. Practical applications of this novel phenomenon seems imminent thanks to
the recent realization of room-temperature magnetoelectricity in hexagonal ferrites[1,2].
So far, field-induced electric polarization has been observed in several polymorphs of
hexaferrites. The associated magnetic orderings under external field bear significant
similarities in spite of apparent differences in crystal structures.
In this work, we will present recent neutron diffraction works on Y-, Z-, M-, and U-type
hexaferrites, and compare the results with field-induced electric polarizations. We will
review and compare their crystal structures, and propose the model that can explain the
common behavior among different types of hexaferrites. The key idea is the coexistence of
easy-plane and easy axis anisotropy fields, which depend on local coordination of Fe3+
(3d5) ions. This model, which involves competing exchange interactions and magnetic
anisotropy fields across the interface, may provide further insights into the development of
high-performance multiferroics.
[1] Y. Kitagawa, et al., Nat. Mater. 9, 797 (2010) [2] S. H. Chun, et al., Phys. Rev. Lett.
108, 177201 (2012)
16
Feb. 3-6 , 2013
Oral-OH02
Structural distortion driven by quadrupole ordering of PrB6
Kun-Pyo HongA, D. T. AdrojaB, R. IbbersonB, Seongsu LeeC, K. A. McEwenD, F. IgaE, and
Je-Geun ParkA
A
Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science, and
Department of Physics & Astronomy, Seoul National University, Seoul 151-747, Korea
B
ISIS Facility, STFC Rutherford Appleton Laboratory, Oxfordshire OX11 0QX, UK
C
Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea
D
Department of Physics & Astronomy, University College London, London WC1E 6BT, UK
E
Department of Physics, Ibaraki University, Mito 310-0056, Japan
Email: kunpyo@snu.ac.kr
Rare-hexaboride has been extensively studied for its unique phase transitions, namely
quadrupolar ordering. PrB6 is one such example with two successive phase
transitions[1,2,3,4]. In this talk, we have investigated the structure of PrB6 throughout the
phase transitions using a high resolution powder diffractometer of ISIS.
We have examined carefully the structural changes around the two successive
magnetic phase transitions: for example one at 7 K from paramagnetic to incommensurate
phases and another one at 4.2 K from incommensurate to commensurate phases.
According to our studies, a monoclinic structure, P 2/m, appears with the slight distortion
of the cell parameters and boron positions below 4.2 K. Interestingly enough, fluctuations
of three boron types were observed along the crystallographic axes.
[1] C. M. McCarthy, C. W. Tompson, R. J. Graves, H. W. Whit, Z. Fisk, H. R. Ott, Solid
State Communications, Vol. 36, 861
[2] S. Kobayashi, M. Sera, M. Hiroi, T. Nishizaki, N. Kobayashi and S. Kunii, Journal of
the Physical Society of Japan, Vol. 70, No. 6, June, 2001, 1721
[3] M. Sera, M.-S. Kim, H. Tou and S. Kunii,. Journal of the Physical Society of Japan,
Vol. 73, No. 12, December, 2004, 3422
[4] M. Sera, S. Goto, T. Koshikawa, M.-S. Kim, H. Tou and F. Iga, Journal of the Physical
Society of Japan, Vol. 75, No. 1, January, 2006, 014706
17
Feb. 3-6 , 2013
Oral-OH03
Jaehong JeongA, E. A. GoremychkinB, T. GuidiB, K. NakajimaC, S. PetitD, P. BourgesD,
Gun Sang JeonE, Shin-Ae KimF, S. FurukawaG, Yong Baek KimG, Seongsu LeeF,
V. KiryukhinH, S-W. CheongH, and Je-Geun ParkA,I
A
Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science, and
Department of Physics & Astronomy, Seoul National University, Seoul 151-747, Korea
B
ISIS Facility, STFC Rutherford Appleton Laboratory, Oxfordshire OX11 0QX, UK
C
Neutron Science Section, MLF Division, J-PARC Center, Tokai, Ibaraki 319-1106, Japan
D
Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, F-91191 Gif-sur-Yvette, France
E
Department of Physics, Ewha Womans University, Seoul 120-750, Korea
F
G
Department of Physics, University of Toronto, Toronto M5S 1A7, Canada
H
Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers
University, Piscataway NJ 08854, USA
I
Center for Korean J-PARC Users, Seoul National University, Seoul 151-747, Korea
Email: hoho4@snu.ac.kr
Multiferroic compounds are one of promising materials for new spintronic device
application such as magnetic/electric memories with the coupling between magnetism and
ferroelectricity. Among several multiferroic compounds, BiFeO3 is probably the only
exception that has both magnetic and ferroelectric transition above room temperature. It
also has the cycloidal spin structure with an extremely long period.
In order to understand the microscopic magnetic interactions in BiFeO3, we have
carried out inelastic neutron scattering experiments on several co-aligned single crystals,
using three spectrometers: AMATERAS of J-PARC, MERLIN of ISIS and 4F2 of LLB.
We employed a so-called sample rotation method for the MERLIN measurements and
could measure the magnon dispersion over the full Brillouin zone [1]. We have also
examined the detailed structures of the unusual low-energy excitations using the TAS, 4F2.
For the analysis, we have calculated the magnon dispersion and conducted Monte-Carlo
simulation using a Hamiltonian with two Heisenberg exchange interaction between the
nearest and the next nearest neighbors and a Dzyaloshinskii-Moriya interaction associated
with its cycloidal magnetic structure. We could determine the interaction parameters that
are consistent with both experimental results and the Monte-Carlo simulations.
[1] Jaehong Jeong et al., Phys. Rev. Lett. 108, 077202 (2012)
18
Feb. 3-6 , 2013
Oral-OS01
Neutron Studies on the Stimuli-Triggered Structural Changes
in Functional Polymer Platforms
K. Char
The National Creative Research Initiative Center for Intelligent Hybrids
The WCU Program of Chemical Convergence for Energy & Environment
School of Chemical & Biological Engineering
Seoul National University, Seoul 151-744, Korea
Email: khchar@plaza.snu.ac.kr
Our current interests with the CRI Center have been focused on the development of
functional polymer platforms whose nanoscale structural changes significantly influence
the performance of energy harvesting or biomedical devices. As a result, the control and
detailed analysis on the shape and size of functional structures within the thin film
platforms are ultimately important for the utilization of such platforms. We have
performed both small angle neuron scattering (SANS) and neutron reflectivity (NR),
which have spatial resolutions ranging from a few to thousands of nanometers to
characterize such polymeric nanostructures and assembling processes triggered by external
stimuli. to obtain desired nanostructures in functional polymer platforms, we have
systematically induced the structural changes and the assembly of polymeric films based
on various stimuli such as external pH, temperature, and specific chemicals. In this
presentation, several examples will be given to demonstrate the power of such neutronbased characterizations: SANS analysis on the polymer-assembled structures of organic
solar cells and NR measurements on the stimuli-triggered changes in the internal
structures of weak polyelectrolyte-based multilayer thin films. These fundamental
characterizations, including both SANS and NR, would give us new insights on the design
of functional polymer platforms for a host of applications such as energy and biomedical
devices.
19
Feb. 3-6 , 2013
Oral-OS02
Periodic distribution of ions confirmed by contrast matching small- angle
neutron scattering in water, organic solvent, and salts
K. Sadakane, M. NagaoA, H. EndoB, and H. Seto
High Energy Accelerator Research Organization, Tsukuba, Japan
A
National Institute of Standards and Technology, Gaithersburg, MD, USA & Indiana University,
Bloomington, IN 47408, USA
Email: sadakane@post.kek.jp
Mesoscopic structures, such as lamellar, in a mixture of water, 3-methylpyridine, and
antagonistic salt, NaBPh4, are discovered in our recent studies [1]. According to
theoretical investigations by Onuki [2], hydrophilic and hydrophobic ions tend to adsorb
near the interface between water and organic solvent. These ions reduce the interfacial
tension between the solvents, and mesoscopic structures are induced [2]. In order to
understand the previous experimental results, it is assumed that pairs of hydrophilic
(Na+) and hydrophobic ions (BPh4-) play roles of surface-active agent in a mixture of
water and 3-methylpyridine. The details of ion distribution, however, have not been
clarified experimentally yet in such mixtures.
In this study, distribution of ions is investigated in a mixture of water (D2O +
H2O), deuterated 2,6-lutidine (2,6-lutidine-d9), and NaBPh4, instead of a mixture of water
and 3-methylpyridine, with employing contrast variation SANS. This mixture also
shows a lamellar structure, which is evident by the
SANS measurement as shown in Fig. 1. The first
sharp peak originated from the lamellar structure is
observed at Q = 5.5×10-2 Å-1 even at the matching
point. This result indicates that Na+ and BPh4- ions
distribute periodically in a mixture of water and 2,6lutidine, whose mean
repeat distance is
approximately 100 Å. In the presentation, we will
also exhibit the result of partial scattering function
derived from the singular-value decomposition.
Figure 1: SANS profiles for the mi
xture of water, 2,6- lutidined9, and NaBPh4.
[1] K. Sadakane, A. Onuki, K. Nishida, K. Koizumi, and H. Seto, Phys. Rev. Lett., 103,
167803 (2009).
[2] A. Onuki, J. Chem. Phys., 128, 224704 (2008).
20
Feb. 3-6 , 2013
Oral-OS03
Neutron Reflectivity Study of Thin Film Polymer Multilayers in
Supercritical Carbon Dioxide
Jaseung Koo, Tadanori KogaA, Sushil SatijaB, Miriam RafailovichA
Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon, Korea
A
State University of New York at Stony Brook, Stony Brook, New York,USA
B
National Institute of Standards and Technology, Gaithersburg, Maryland, USA
Email: jkoo@kaeri.re.kr
We investigated the effect of supercritical carbon dioxide (scCO2) on the swelling
behavior and diffusion dynamics of polymer thin film. scCO2, namely regime at
temperatures and pressures above the critical point values, exhibited large density
fluctuations resulting in enhancement of the solubility of the polymers, thereby obtaining
the significant attention for “a green solvent” in polymer processing and polymer
synthesis. In this study, we used the neutron reflectivity which is an ideal tool for in situ
measurement of polymer multilayer structure in thick-well vessel flushed with CO2 gases
or liquids due to the large penetration depth inherent with neutrons. The results showed
that anomalous dilation of polystyrene (PS) was obtained at the ridge (T = 36 oC and P =
8.2 MPa). This excess CO2 sorption also improved miscibility of thin polymer bilayer, top
PS and bottom deuterated polymethyl methacrylate (d-PMMA) layers. In addition,
introducing CO2 enhanced the mobility of polymer chains even near the silicon substrates
and the confinement effect due to interaction between polymer chains and substrates was
alleviated in scCO2.
21
Feb. 3-6 , 2013
Oral-OS04
Small Angle Neutron Scattering Study of Phase Behaviors of
Amphiphilic Molecules in Aqueous Solution
T.-H. KimA, C.-Y. SongB, Y.-S. HanA, J.-D. JangA, B.-S. SeongA
A
Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon, Korea
B
Department of Bio and Brain Engineering, KAIST, Daejeon, Korea
Email: taehwan@kaeri.re.kr
Amphiphilic molecules such as surfactant and block copolymer self-assemble into
various micellar structures in aqueous solution and reveal excellent phase behaviors under
various external conditions such as pH, temperature, or additives. Therefore, these
amphiphilic molecules have been of great interests in a broad spectrum of potential
applications such as nano-building blocks or drug delivery in nano- or bio-science.
However, the self-assembled structure of amphiphilic molecules under the various external
conditions has not been fully exploited yet. Here a phase behavior of amphiphilic
molecules including surfactants and block copolymers at varying additives and
temperature has been investigated. To study the self-assembled structure of amphiphilic
molecules, small angle neutron scattering (SANS) experiments were conducted at
HANARO 40m SANS instrument. The SANS intensity revealed that surfactants and
triblock copolymers formed various micellar structures such as sphere, cylinders or
vesicles depending on the additive and temperature [1].
[1] T.-H. Kim, Y.-S. Han, B.-S. Seong, and K. P. Hong, Soft Matter, 7, 10070 (2011).
22
Feb. 3-6 , 2013
Oral-ON01
Investigation of Hydrogen Storage Mechanism in nano-porous
materials by in-situ neutron scattering
Yong Nam Choi, Hee-ju Lee, In Hwa Cho, and Seunggi Kang
Sang Beom Choi and Jaheon Kim
Dept. of Chemistry, Soongsil University, Seoul 156-743, Korea.
Yong Soo Park and Kyung Byung Yoon
Dept. of Chemistry, Sogang University, Seoul 121-742, Korea.
E-mail: dragon@kaeri.re.kr
The goal of hydrogen storage performance (capacity) by the US DOE has alleviated
recently because of the retardation in development of epochal materials. On this account,
the hydrogen storage field became a bottleneck of the forthcoming ‘hydrogen economy’.
One of the main reasons for this situation maybe an unawareness of the storage
mechanisms at the moments of hydrogen sorption and desorption. Various efforts have
been paid by materials scientists on searching for better materials by trial & errors
(synthesis & evaluation) and chemical inspirations, but it was not successful until now.
Nano-porous materials, which store hydrogen molecules via the physi-sorption
mechanism, have attracted much attention because of its excellent reversibility
(sorption↔desorption). In-situ neutron scattering setup has established at HANARO
neutron beam instruments (HRPD and DC-TOF). Precise measurement of the temperature
(2~320K) and the pressure (0~100 bars) with neutron scattering data enables us to discuss
about the behavior of hydrogen at the very moment. Experimental details and results
obtained by HRPD and DC-TOF spectrometer on various nano-porous materials, zeolites
and MOFs (metal-organic frameworks), will be presented with simple analyses.
Figure 1. The unit cell structure of MOF205 (left) and rotational transition spectra of H2 adsorbed
on MOF205 at 3.5K (right).
23
Feb. 3-6 , 2013
Oral-ON02
In situ neutron diffraction scattering study of thermal decomposition of
LiBH4 mixed with modified MWCNT
In Hwa Cho, Hee-ju Lee, Seunggi Kang and Yong Nam Choi
Email: ihcho@kaeri.re.kr
LiBH4 is a promising candidate for the hydrogen storage material due to its extremely
high theoretical hydrogen capacity (18 wt.%, 121 Kg m-3). However, its practical
application has not been easy because of the high reaction enthalpy (~75 kJ mol-1 H2) and
the slow hydrogen dissociation kinetics. To addition of catalyst such as MWCNT (multiwall carbon nanotube) is the one way to overcome these problems since the additives can
destabilize LiBH4 ,which may reduce reaction enthalpy and increase the surface area of
LiBH4 confining it to nano-sized structures of MWCNT. And it is very important to
observe dissociation processes during thermal decomposition of LiBH4. In addition,
neutron diffraction is powerful tool since neutron can see the signal from hydrogen
directly unlike other particles (photon, electron etc.). Our group studied composite system
of LiBH4 mixed with ball-milled MWCNT using in situ neutron diffraction and the effect
of the MWCNT is discussed.
24
Feb. 3-6 , 2013
Oral-ON03
New iron-based mixed-polyanion cathodes for lithium and sodium
rechargeable batteries: Combined first principles calculations and
experimental study
Hyungsub Kima,b, Inchul Parka, Dong-Hwa Seoa, Seongsu Leeb, Sung-Wook Kima, YoungUk Parka and Kisuk Kanga
a Department of Materials Science and Engineering, Research Institute of Advanced Materials,
Seoul
National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
b Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong-gu, Daejeon 305-600, Republic
of Korea
Email: matlgen1@snu.ac.kr
New iron-based mixed-polyanion compounds LixNa4−xFe3(PO4)2(P2O7) (x = 0−3)
were synthesized, and their crystal structures were determined. The new compounds
contained three-dimensional sodi-um/lithium paths supported by P2O7 pillars in the
crystal. First principles calculations identified the complex three-dimensional paths with
their activation barriers and revealed them as fast ionic conductors. The reversible
electrode operation was found in both Li and Na cells with capacities of one-electron
reaction per Fe atom, 140 mAh g−1 and 129 mAh g−1, respectively. The redox
potential of each phase was ~3.4 V (vs. Li) for the Li-ion cell and ~3.2 V (vs. Na) for
the Na-ion cell. The properties of high power, small volume change, and high thermal
stability were also recognized, presenting this new compound as a potential competitor to
other iron-based electrodes such as Li2FeP2O7, Li2FePO4F, and LiFePO4.
25
Feb. 3-6 , 2013
Oral-ON04
Current status and activity of Engineering Materials
Diffractometer TAKUMI at J-PARC
J. AbeA, S. Harjo, W. Gong, T. Iwahashi and K. Aizawa
Japan Atomic Energy Agency, Ibaraki, Japan
A
J-PARC Center, Tokai, Japan
Email: abe.jun@jaea.go.jp
The Engineering Materials Diffractometer "TAKUMI" which is dedicated to investigate
the stress-strain state and the crystallographic structure in engineering materials and/or
components was constructed at BL19 in J-PARC/MLF. TAKUMI extracted first beam in
October 2008 and the user program started very early in January 2009. Although the
Tohoku earthquake occurred in March 2011 and TAKUMI was severely damaged, after
the restoration work, TAKUMI has been restored and restarted commissioning in March
2012. In the following month the user program was restarted again.
The best resolution (Δd/d) and d-range of TAKUMI is 0.17 % and 0.5-2.7 Å (single
frame mode), respectively. Radial collimator (gauge width: 1mm, 2mm, 5mm) can be
attached to determine the sample gauge volume, which allows strain-mapping
measurements of engineering materials. TAKUMI has also several sample
environmental devices that realize to perform in-situ neutron diffraction experiments
under various conditions. Deformation test up to 50 kN at low temperatures (down to
6K) or high temperatures (up to 1273 K) can be performed. In addition, a texture
measurement procedure using a cradle has been also developed to ready for user’s
experiments.
TAKUMI also has started his upgrading works. A fatigue machine and a stroboscopic
measurement method for the fatigue measurements are in under development. A
controlling software linking various devices is also under development. Furthermore, a
simultaneous measurement system of neutron diffraction patterns and AE (acoustic
emission) signals is also developed; AE is elastic wave generated from materials under
deformation. This system allows us to measure the strain, acquiring information of the
timing, position and propagation of the crack or dislocation generated in the engineering
material under stress.
In the presentation, current status of TAKUMI, current sample environments, and
several examples performed at TAKUMI, will be introduced.
26
Feb. 3-6 , 2013
Oral-ON05
Small Angle Neutron Scattering Study of Nano Sized Microstructure in
Ferrous Alloys
Young-Soo HanA, Xiadong Mao, Jinsung Jang and Deuk-Gun Park Park
Email: yshan@kaeri.re.kr
The nano sized microstructures in Fe-Cr ODS(Oxide Dispersion Strengthened) alloys
and the Fe-Cu alloy were studied by SANS(Small Angle Neutron Scattering). The Fe-Cr
ODS steels were manufactured by HIP(Hot Isostatic Pressing) with different chemical
compositions and fabrication conditions. The SANS experiments were performed by the
40m SANS instrument at HANARO. Due to the ferromagnetic nature of the ferrous alloys,
the horizontal magnetic field of 1 Tesla were applied during the SANS experiment. The
nano sized microstructure such as yttrium oxides and Cr-oxides were quantitatively
analyzed by SANS in Fe-Cr ODS alloys. The effects of chemical compositions and
fabrication conditions on microstructure were discussed according to the quantitative
analysis results by SANS. The nano sized Cu clusters were also analyzed by SANS in the
Fe-Cu alloy. The effect of heat treatment on microstructure were discussed according to
the SANS analysis results in the Fe-Cu alloy. The ratio between magnetic and nuclear
scattering components was calculated and the characteristics of the non-magnetic nano
sized microstructures in experimental ferrous alloys were discussed from the calculated
ratio.
27
Feb. 3-6 , 2013
Poster-PI01
Universal Event Recording DAQ System in J-PARC/MLF
T. Nakatani, Y. Inamura and T. ItoA
A
CROSS-Tokai, Tokai, Japan
Email: takeshi.nakatani@j-parc.jp
We have already implemented the neutron event recording DAQ (data acquisition)
system in the neutron experiment instruments at J-PARC/MLF. The neutron signals
detected by 3He-PSDs, scintillators and so on are converted to the digital data by the DAQ
electronics and stored into the hard disks of the DAQ computers as the event with TOF
(Time Of Flight) and positions. Simultaneously, each neutron production event in the
spallation source is recorded with the absolute time. Combining the neutron detection
events and the neutron production events, we can recognize when and where each neutron
is detected.
In this year, we have introduced the universal signal event recording board which we
call “TrigNET” into our DAQ system. The TrigNET has various signal input ports
which are 8ch DIOs, 2ch fast ADCs (100MSPS), slow 4ch ADCs (10～1kHz) and the
SiTCP interface. The TrigNET can output the event data which consist of the elapsed time
from the trigger which indicate a neutron production, the event source and the signal
values. We have incorporated the TrigNET with the several instruments and measured the
neutron optics device signal, which are the rotating pulse of the choppers, the phase of the
neutron polarizer and so on, and the external fields of the sample environment devices
which are temperature, electric, magnetic, laser and so on. All of the event data output
from these boards are collected by DAQ-Middleware [1], which is the standard DAQ
software in J-PARC/MLF. By using this DAQ system, we can analyze all event date with
the single clock. And then, we will be able to multi- dimensionally analyze time-transient
measurements combined the several conditions of the sample environment or the neutron
optics.
In this presentation, we will show the details and applications of our DAQ system.
[1] K. Nakayoshi, Y. Yasu, H. Sendai, E. Inoue, M. Tanaka, S. Sato, S. Muto, J. Suzuki,
T. Otomo, T. Nakatani, T. Ito, Y. Inamura, M. Yonemura, T. Hosoya and T. Uchida,
Nucl. Instr. and Meth. A623 (2010) 537-539
28
Feb. 3-6 , 2013
Poster-PI02
Development of New Special Environment Powder Neutron
Diffractometer, SPICA
M. Yonemura, K. MoriA, T. Kamiyama, T. FukunagaA, S. Torii, M. Nagao, Y. OnoderaA,
Y. Ishikawa
High Energy Accelerator Research Organization, Tokai, Japan
Kyoto University Reactor Research Institute, Kumatori, Japan
Email: yone @post.kek.jp
A
Batteries are very notable technology in this world. They are used as power storage
systems for smart phones, tablet pad, laptop PC, and etc. Lifestyle transformations have
been provided by appearing new batteries system because these electronic devices are
powered by batteries. For next ecological lifestyle, more high-capacity and long-life
batteries are required by electric and hybrid vehicles. To support the development of new
generation batteries, we decided to install a new dedicated neutron diffractometer for
batteries in J-PARC.
SPICA, a new special environment powder neutron diffractometer, is built up at BL09
in MLF/J-PARC. This instrument is optimized for in situ measurements of batteries. The
SPICA instrument is located 52 m far from the poisoned and decoupled moderator. The
maximum diameter of the sample space is 2 m. These unique geometries mean the
measurements can be performed in realistic environment with external variables such as
temperature, electric field (current density, pulsed current, and etc.), high pressure under
time-resolved conditions. The over 1600 3He gas PSD (Position Sensitive Detector) are
arranged on a cylindrical locus from 2 theta = 175 to 10 degrees (See. Fig.1). These
detectors have an active length of 0.6 m and are positioned at 2 m from the sample.
Neutron guide tubes were selected to have the elliptical arrangements in order to transport
neutrons to the sample position and increase the beam intensity without losing the
resolutions.
The commissioning of SPICA was carried out in the middle of June 2012 for 2 weeks.
The instrumental parameters and several diffraction patterns were collected and verified
these are consistent with the instrumental design. The current status of SPICA will be
reported.
Figure 1: Detectors layout of the SPICA instrument. Neutron beam is transported from left side. The sample
vacuum chamber can be removed.
29
Feb. 3-6 , 2013
Poster-PI03
Development of New Rietveld Code as Powder Diffraction Analysis
Suite, Z-Code
M. Yonemura, R. Tomiyasu, D. SulistyanintyasA, K. IwaseA, A. HoshikawaA, T. IshigakiA,
K MoriB, R. KiyanagiC, J.R. Zhang, S. Torii, M. Nagao, Y. Ishikawa and T. Kamiyama
High Energy Accelerator Research Organization, Tokai, Japan
A
iFRC Ibaraki University, Tokai, Japan
A
Kyoto University Reactor Research Institute, Kumatori, Japan
C
Materials and Life Science Division, J-PARC, Tokai, Japan
Email: yone @post.kek.jp
New Japanese Spallation Neutron Source (JSNS), Materials and Life Science Facility
(MLF) in Japan Proton Accelerator Research Complex (J-PARC) has been inaugurated.
Six different powder diffractometers (Super High Resolution (S-HRPD), High Throughput
(iMATERIA), Engineering (TAKUMI), Total Diffraction (NOVA), High
Pressure(PLANET) and Special Environment(SPICA)) have already put out the first great
data. In this situation, new powerful and useful analysis software for powder diffraction
data is desired. Since 2004, the powder diffraction group in J-PARC has started to develop
a new powder diffraction analysis suite, Z-Code (code-name for the development). It is the
integrated environment for finding out crystal structures using various analysis methods
from powder diffraction data. For example, It has the general functions of Indexing, Peak
Searching, Structure Matching from a Data Base, and Conventional Rietveld analysis. ZCode also supports Texture analysis, Profile analysis, Fourier synthesis, and Maximum
Entropy Method as the advanced analysis components.
We just released and began to test the new Rietveld analysis software called “ZRierveld” with the first users of the powder diffractometers in J-PARC. Z-Rietveld is the
one component of Z-Code. It has a Graphical User Interface (GUI) and many powerful
features for the refinement of crystal structures. Z-Rietveld has demonstrated nice
refinements of a complicated structure models using multiple data sets, such as x-ray and
neutron ones. In this presentation, more features and details of Z-Rietveld will be
discussed.
30
Feb. 3-6 , 2013
Poster-PI04
Current Status of Extreme Environment Single Crystal Neutron
Diffractometer SENJU at J-PARC
T. Ohhara, R. KiyanagiA, T. KawasakiA, K. OikawaA, K. KanekoA, I. TamuraA, A. Nakao,
T. Hanashima, K. Munakata, H. KimuraB, C.-H. LeeB, Y. NodaB, M. TakahashiC, T.
KiyotaniD, K. OshimaC and M. AraiA
Comprehensive Research Organization for Science and Society, Tokai, Japan
A
J-PARC Center, Japan Atomic Energy Agency, Tokai, Japan
B
Tohoku University, Sendai, Japan
C
Tsukuba University, Tsukuba, Japan
D
Showa Pharmaceutical University, Machida, Japan
Email: takashi.ohhara@j-parc.jp
SENJU is a new single crystal time-of-flight neutron diffractometer installed at MLF of
J-PARC. SENJU is designed for precise crystal and magnetic structure analyses under
multiple extreme environments such as low-temperature, high-pressure and highmagnetic field. SENJU is also designed for taking diffraction measurements of small
single crystals less than 1.0 mm3 in volume. Construction of SENJU was completed on
March 2012 and subsequently, diffraction images of several organic and inorganic
crystals such as NaCl, ruby and sucrose were measured at room temperature. In these
measurements, Bragg reflections in the high-Q region (d-spacing < 0.5 Å) were
successfully observed. On December, diffraction measurement of a laboratory X-ray
size single crystal of taurine (0.6 mm; 0.1 mm3) was carried out (Fig. 1), and the
obtained data set were successfully analyzed. Measurement time was 6 days (270kW)
and final R-factor was 7.16%. Diffraction measurements using a 4K cryostat were also
carried out. Diffraction measurements of a TbCoGa5 crystal which shows
antiferromagnetic ordering blow 35 K, were carried out at 50 K and 10 K. Magnetic
Bragg reflections derived from the ordering were clearly observed at 10 K.
Figure 1 Diffraction image of a 0.1 mm3 taurine single crystal.
31
Feb. 3-6 , 2013
Poster-PI05
Development of TOF imaging system with a combination of a
neutron image intensifier and a high speed camera
H. Ueno, T. Kamiyama, Y. Kiyanagi
Faculty of Engineering, Hokkaido University, Sapporo, Japan
Email: ueno.hiroki@eng.hokudai.ac.jp
A high speed imaging device combined with a neutron image intensifier (I.I.) and a
high-speed camera is developed for energy resolving neutron transmission measurement
with higher spatial resolution and wider vision. The image recording system for time-offright (TOF) spectra is adapted to pulsed neutron from an accelerator. The periodic
exposure of the camera starts by an electrical pulse which is generated in
synchronization with the accelerator, and several tens of TOF images are taken between
them. Moreover, we constructed the recording system which can add their TOF images
for each time channel automatically to save data-processing capacity of the control PC.
As an advantage of this development, long time recording becomes possible.
In our imaging system, transmitted neutron is converted to visible ray by neutron I.I.
(UltimageTMnγ-04, Toshiba) at first. Then, it is reflected to optic system contains the
camera in the neutron shield by a mirror. The optic system is consist of Fiber Optic
Plate (FOP) which can transfer an image without using a lens, the second I.I. for visible
light (C9016-02, Hamamatsu) and high-speed CMOS camera (MC1362, Mikrotron)
from the upstream. An alignment of these parts allows us to adjust the size transmission
image on the FOP, caught by the camera. The recording system can be selected image
size from 250×250, 300×300, 500×500 and 1000×1000 pixels, however the number of
available TOF channels decreases with larger image size. Therefore, we need to choose
appropriate condition for the experiment (higher spatial or higher time resolution).
The operational experiment for this imaging system was carried out at the
Hokkaido University 45 MeV electron liniac which is equipped the solid methane cold
neutron source and it can supply pulsed neutron with 50 Hz. The flight path length from
the source to the neutron I.I. was 5.15 m. In this experiment, the exposure time per one
TOF channel was decided to 200 μsec and the number of TOF channel was 45. Therefore,
a measurable time channel was until 9 msec and it is corresponding to about 6.9 Å in
neutron wavelength. The image size was chosen to the smallest 250×250 because of the
hardware limit of this device. Metallic plates of Fe, Pb and Cu were used as samples, and
their thicknesses were 15, 12 and 8 mm, respectively.
32
Feb. 3-6 , 2013
Fig.1 shows the neutron transmission image at 1st TOF channel (left) and 27th (right) on
behalf of later channels, which are normalized by the images taken without the metallic
plate samples under the same experimental conditions. There is a large difference on Pb area
between them. The 1st image was exposed immediately after the electron irradiation to the
target by the accelerator, therefore it isn’t influenced by only neutron but also prompt γ-ray
generated at the target, unlike subsequently taken images. This is coincident with the fact that
Pb has lower neutron cross section and enough shielding ability against for γ-ray radiation
compared with Cu and Fe.
Fig.2 shows the wavelength dependence of transmitted neutron intensity in the area of Fe,
Cu and Pb metallic plates. There is a clear dip at around 4.0 Å in Fe and a small one in Cu. It
is conceivable that these dips are originated in the Bragg edge of Fe and Cu, respectively.
The Bragg edge of Pb is not appeared in Fig.2 because of its small neutron cross section.
Wide TOF images and spectra from which we can discriminate the Bragg edge were
obtained by this experiment.
Fig.1 Normalized neutron transmission images
at 1st TOF channel (left) and 27th (right).
33
Fig. 2 Wavelength dependence of
transmitteed neutron intensity of
metalic plates of Fe, Pb and Cu
Feb. 3-6 , 2013
Poster-PI06
Numerical study of MAGIC chopper performance by Monte Carlo
simulation
K. Ikeuchi1, M. Nakamura2, R. Kajimoto1, and M. Arai2
1Research Center for Neutron Science and Technology, Comprehensive Research Organization for
Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
2Neutron Science Section, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
Email: k_ikeuchi@cross.or.jp
As an effective device for utilizing multiple incident energies on a chopper spectrometer, a
new type Fermi chopper which has neutron supermirrors tucked into its slit package, namely
MAGIC chopper, was suggested [1]. In order to design a component of the MAGIC chopper
especially for Fermi chopper spectrometer 4SEASONS installed at J- PARC, we demonstrate a
numerical simulation of MAGIC chopper performance by Monte Carlo method. Neutron
transmittance of a Fermi chopper with and without 3Qc neutron supermirror was calculated.
Slit width of 150 mm and length of 17 mm were modeled as a slit package of the Fermi
chopper. Rotating frequency was assumed to be 100 Hz. Figure 1 shows the time-of-flight
(TOF) spectra of transmitted intensities from rotating slit packages with and without neutron
supermirrors. As shown in Figure 1, the intensity gain of MAGIC chopper is found to be
significant. It is also demonstrated that the MAGIC chopper can widen the chopper opening
time effectively in the longer- TOF region. In this presentation, we will discuss the optimized
design for the MAGIC chopper based on the simulation results.
Figure 1. TOF spectra of the MAGIC
chopper (open circle) and mirror-less
Fermi chopper (solid circle).
[1] M. Nakamura, M. Arai, R.
Kajimoto, T. Yokoo, K. Nakajima,
and TH. Krist, Journal of Neutron
Research, 16 87-92 (2008).
34
Feb. 3-6 , 2013
Poster-PI07
A Cold-Neutron Disk Chopper Spectrometer, AMATERAS
T. Kikuchi A, K. Nakajima A, S. Ohira-Kawamura A, Y. Kawakita A, M. Nakamura A, R.
Kajimoto B, Y. Inamura A, N. Takahashi A, K. Aizawa A, K. Suzuya A, K. Shibata B, T.
Nakatani A, K. Soyama A, H. Tanaka A, W. Kambara A, T. Iwahashi A, Y. Itoh A,
K. Kakurai C, R. E. Lechner D, F. Mezei A, E, and M. Arai1A
A
Neutron Science Section, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
B
C
Comprehensive Research Organization for Science and Society, Tokai, Ibaraki 319-1106, Japan
Quantum Beam Science Directorate, Japan Atomic Research Agency, Tokai, Ibaraki 319-1195, Japan
D
Guest at Helmholtz-Zentrum Berlin (HZB), Hahn-Meitner-Platz 1, 14109 Berlin, Germany
E
Institute for Solid State Physics and Optics, Hungarian Academy of Science, Budapest, Hungary
Email: tkikuchi@post.j-parc.jp
AMATERAS is a cold-neutron disk-chopper-type spectrometer at Materials and Life
Science Experimental Facility of J-PARC (Fig.1). By using a series of high-speed diskchoppers and owing to the high peak intensity from a coupled moderator source at MLF,
AMATERAS realizes both high-intensity and fine and flexible energy resolution
measurements in quasielastic and inelastic neutron scattering experiments from cold to
thermal neutron energy region. [1, 2] In our presentation, we will show the over view of
AMATERAS including some of examples of recent scientific outputs.
[1] K. Nakajima et al., J. Neutron Res. 15, 13 (2007).
[2] K. Nakajima et al., J. Phys. Soc. Jpn. 80 SB028 (2011).
Fig. 1 AMATERAS, a cold-neutron disk chopper spectrometer at MLF, J-PARC.
35
Feb. 3-6 , 2013
Poster-PI08
Current Status of the Small and Wide Angle Neutron Scattering
Instrument (TAIKAN) of J-PARC
S. TakataA, J. SuzukiA, B, T. ShinoharaA, T. OkuA, T. TominagaA, T. NakataniA, Y.
InamuraA, T. ItoB, K. OhishiB, H. IwaseB, H. KiraB, K. SuzuyaA, K. AizawaA, M. AraiA, T.
OtomoC, M. SugiyamaD
A
J-PARC Center, JAEA, Tokai, Japan
B
CROSS, Tokai, Japan
C
KEK, Tsukuba, Japan
D
KURRI, Kumatori, Japan
Email: shinichi.takata@j-parc.jp
The small and wide angle neutron scattering instrument, TAIKAN, was installed on
BL15 in the Materials and Life Science Experimental Facility (MLF) of J-PARC.
TAIKAN is designed for efficient measurement in wide-q range of 0.005 ~ 20 [Å-1].
The 1040 3He-PSD tubes with 8 mm in diameter and gas pressure of 6 atm are mounted
on four detector banks of small-, middle-, high-, and backward-angle. Fig. 1 shows the
photograph of small- and middle-angle detector bank from the front flange of
TAIKAN’s vacuum chamber. The two detector banks in the chamber are surrounded by
the B4C shielding boards, in order to avoid the crosstalk between facing detectors and
reduce the background.
On-beam commissioning was started in January 2012, and user program has begun
since March 2012. We will report on the results of some standard samples, the
instrument performance, and the current status of TAIKAN.
Fig.1: Photograph of detector banks (small- and
middle-angle) in TAIKAN’s vacuum chamber.
36
Feb. 3-6 , 2013
Poster-PI09
Present Status of a New Pulsed Neutron Imaging Instrument at
J-PARC
T. ShinoharaA, T. KaiA, M. SegawaA,D, H. IikuraA,E, M. OoiA, K. OikawaA, M. HaradaA, K.
Sakai A, K. SoyamaA, K. AizawaA, M. AraiA, T. KamiyamaB, H. SatoB, K. KinoB, H.
YokotaC, Y.YamagataC, M. KuretaD, T. SakaiE, R. YasudaE,
M. MatsubayashiE, Y. SaitoF, Y. KawabataF, K. MochikiG and Y. KiyanagiB,
A
Hokkaido Univ., Sapporo, Japan
C
RIKEN, Wako, Japan
D
NSED, JAEA, Tokai, Japan
E
QuBS, JAEA, Tokai, Japan
F
KURRI, Osaka, Japan
G
Tokyo City Univ., Tokyo, Japan
Email: segawa.mariko@jaea.go.jp
B
We are now constructing a pulsed imaging instrument at beam line 22 in MLF (Materials
and Life Science Experimental Facility) of J-PARC (Japan Proton Accelerator Research
Complex). This is the world first instrument dedicated to the pulsed neutron imaging,
which enable us to make two dimensional image of the crystalline structure and nuclide
composition and magnetic fields using the features of the pulsed neutron [1- 3]. This
instrument also has capability to give the high-resolution images using a higher L/D option
compared with other facilities in Japan.
In this presentation, we introduce the current status of the instrument development and
the prospective practical researches.
[1] H. Sato, T. Kamiyama, Y. Kiyanagi, Materials Transactions, Vol.52, pp.1294-1302,
(2011)
[2] T. Kai et.al., Nuclear Instruments and Methods A, 651, 126–130 (2011)
[3] T. Shinohara et.al., Nuclear Instruments and Methods A, 651, 121-125 (2011)
37
Feb. 3-6 , 2013
Poster-PI10
Current Status of a newly developed Polarized Neutron Reflectometer
(Sharaku) at bemaline BL 17 of J-PARC
Masato Kubota
Japan Atomic Energy Agency
Email: kubota.masato@jaea.go.jp
As a nondestructive technique, neutron reflectivity brings significant information on the
magnetism at interfaces even in thin films. We constructed a newly developed polarized
neutron reflectometer at BL17 SHARAKU installed at MLF, and started the user program
in the end of January 2012. The magnet with high field and the spin polarization apparatus
are available. We report the current status and future prospects of the beamline in terms of
a commissioning and a research.
The collaborators for the construction and the commissioning of BL17 are as follows;
M. Takeda(Leader) , D. Yamazaki(sub-Leader), K. Soyama, R. Maruyama, H. Hayashida,
M. Kubota, H. Asaoka, T. Yamazaki, K. Aizawa, T. Kamiyama, M. Arai, Y. Inamura, K.
Kaneko, T. Nakamura, T. Nakatani, K. Oikawa, K. Sakasai, T. Shinohara, K. Suzuya, I.
Tamura, K. Toh, H. Yamagishi, N. Yoshida, Y. Sakaguchi, T. Mizusawa, T. Itoh, T.
Ohhara, J. Suzuki, and T. Hirano.
38
Feb. 3-6 , 2013
Poster-PI11
Quantitative evaluation of nuclide density distribution in
a substance using the neutron resonance absorption spectroscopy at JPARC/MLF/BL10
H. HasemiA, M. HaradaB, T. KaiB, H. SatoA, M. OoiB, M. SegawaB, T. ShinoharaB, K.
KinoA, T. KamiyamaA, Y. KiyanagiA
A
Graduate School of Engineering, Hokkaido University, Sapporo, Japan
B
Email: hasemi@eng.hokudai.ac.jp
The neutron resonance absorption spectroscopy (N-RAS) is the technique of a
combination of prompt gamma ray measurement (or neutron transmission measurement)
and a time-of-flight method. Using the technique we can distinguish nuclides or isotopes
and obtain the information of atomic density and dynamics. The observed resonance peak
is expressed by convolution of intrinsic resonance and neutron emission time distribution
from moderator. To perform quantitative analysis of resonance peak, the emission time
distribution must be reproduced at arbitrary neutron energy by synthetic functions. The
functions expressing the time distribution (pulse) of J- PARC/MLF/BL10 have not been
considered until now. Therefore, we have aimed to make a synthetic pulse function
suitable to BL10. As an example, we evaluated atomic number density of Ta foil by NRAS.
Firstly, we calculated the emission time distributions of epithermal neutron at
BL10 by simulation and fitted several kinds of pulse functions to them. We found that the
Cole-Windsor function well reproduced the time distribution at arbitrary energy. Next,
we implemented the pulse function in resonance shape analysis code “REFIT[1]” to
analyze the resonance peaks. As an example, we analyzed the resonance dip in the timeof-flight spectrum due to the resonance of Ta sample with a thickness of 0.01 mm (area
density: 5.48×10-5 atoms/barn). Fig.1 shows the resonance dip due to 4.28 eV Ta
resonance and the result of fitting using REFIT code. By fitting a simulation result to
the experimental one using the REFIT code, we obtained a thickness of 0.01 mm
(5.48×10-5 atoms/barn) within an error of ±0.44%. We succeeded to synthesize the pulse
function and to evaluate the nuclide density by N-RAS.
39
Feb. 3-6 , 2013
1.00
Transmission
0.90
0.80
0.70
Measured
Fit
Difference
0.60
Difference
0.50
0.10
0.05
0.00
-0.05
-0.10
470
480
490
500
TOF / us
510
520
530
Fig. 1 The resonance dip due to 4.28 eV Ta resonance and the result of fitting using
REFIT code.
[1] M.C. Moxon and J.B. Brisland, “GEEL REFIT, A least squares fitting program for
resonance analysis of neutron transmission and capture data computer code”, AEAInTec-0630, AEA Technology (1991)
ACKNOWLEDGEMENT: This work was supported by a Grant-in-Aid for Scientific
Research (S) from Japan Society for the Promotion of Science (No. 23226018).
40
Feb. 3-6 , 2013
Poster-PS01
NR Studies on the Stimuli-Triggered Changes
in Polymer Thin Films with Different MWs
Y. JangA, H. SonA, J. SeoA, B. AkgünB, S. SatijaB, and K. Char*A
A
The National Creative Research Initiative Center for Intelligent Hybrids,
The WCU Program of Chemical Convergence for Energy & Environment,
School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Korea
B
National Institute of Standards and Technology Center for Neutron Research, 100 Bureau Drive,
MS 6100, Gaithersburg, MD 20899-6100, USA
Stimuli-responsive polymeric thin films based on polyelectrolyte (PE) multilayer thin
films and polymer brush platforms with active moieties have received significant attention
for many potential applications. In the present study, we prepared multilayer thin films
containing a cationic weak PE, linear poly(ethylene imine), and an anionic weak PE,
poly(methacrylic acid) with different molecular weights (MWs) in order to investigate the
effect of MW on the external pH-triggered release of model multilayer platforms. Welldefined internal structure of the model stimuli-triggered release platforms was obtained by
the spin-assisted layer-by-layer (LbL) deposition [1]. Despite the difficulty in detecting the
nanometer-scale internal changes of the multilayer films, we have monitored the pHinduced delamination or release of target deuterated PMAA chains with different MWs
and corresponding viscoelastic properties of the multilayer films using neutron reflectivity
(NR) as well as quartz crystal microbalance with dissipation (QCM-D).
In addition, for further research on NR, structural changes of reactive polymer brush
platforms prepared by the surface reversible addition–fragmentation chain transfer
(RAFT) polymerization with pentafluorophenyl acrylate monomer [2] are investigated
with NR. The reactive ester moieties can be easily modified to impart functions to the
polymer brush films by the simple post-polymerization modification with primary amines.
We now work on clarifying the reaction mechanism of the RAFT-polymerized brush
platforms by monitoring the brush profile along with the concentration gradient of aminepenetration as a function of MW and grafting density of the polymer brushes.
[1] Y. Jang, B. Akgun, H. Kim, S. Satija, and K. Char, Macromolecules, 45, 3542 (2012)
[2] J. Choi, P. Schattling, F. D. Jochum, J. Pyun, K. Char, and P. Theato, J. Polym. Sci.
Part A: Polym. Chem., 50, 4010 (2012)
41
Feb. 3-6 , 2013
Poster-PS02
SANS Studies on the Effect of Additives
on the Morphology of Organic Solar Cells
W. T. ChoiA, J. KoA, T.-H. KimB, Y.-S. HanB, and K. Char*A
A
The National Creative Research Initiative Center for Intelligent Hybrids,
The WCU Program of Chemical Convergence for Energy & Environment, School of Chemical &
Biological Engineering, Seoul National University, Seoul 151-744, Korea
B
HANARO Center, Korea Atomic Energy Research Institute, Daejeon, 305-353, Korea
Organic photovoltaics (OPVs) have attracted much attention as lightweight, low-cost,
and easy to process replacements for inorganic counterparts. Despite recent rapid
developments in OPVs, the OPVs still suffer from the low device performance compared
with inorganic counterparts due to their short exciton diffusion length as well as low
charge mobility. In order to overcome these problems, there have been reports on using
self-organized poly[3-hexylthiophene]s (P3HT), called as P3HT nanowires, to create
continuous pathways and also to enhance the crystallinity of active layers. However, there
is lack of studies on the phase size of phenyl-C61-butyric acid methyl ester (PCBM)
surrounding the P3HT nanowires. In the present study, we report the effect of additives on
the BHJ morphologies, which could enhance the P3HT crystallinity as well as varying the
size of the PCBM phase. We employed a new additive, which has better solubility for
PCBM while keeping the solubility for P3HT low in the blend solution. We performed the
small angle neutron scattering (SANS), which has the spatial resolution ranging from a
few to thousands of nanometers to characterize the nano-morphologies of P3HT:PCBM
blends to address the effect of the addition of additives. The SANS results showed that by
keeping the P3HT solubility low in the blend solution, higher P3HT crystallinity was
achieved. At the same time, the increase in the PCBM solubility led to smaller
nanodomains of PCBM agglomerates. Based on the morphological variations by adding
additives, P3HT:PCBM BHJ solar cell devices were fabricated and the maximum power
conversion efficiency of 3.24% was achieved with the addition of an additive, which is the
43% enhancement when compared with the reference sample without additives.
42
Feb. 3-6 , 2013
Poster-PS03
Dynamics of PEO Chain in Micro-phase Separated Structure
Formed by Liquid-crystal Amphiphilic Di-block Copolymer
A
A
B
T. Yamada, J. Jang , H. Yoshida and T. Iyoda
Cross−Tokai, Tokai, Japan
A
Graduate School of Urban Environmental SCences, Tokyo Metropolitan University, Tokyo, Japan
B
Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama, Japan.
Email: t_yamada@cross.or.jp
PEO-AZO amphiphilic di-block copolymer [1] which consists crystalline PEO and sidechain liquid-crystal having azobenzene moieties as a mesogen polymethacrylate
derivatives (AZO) forms well ordered hexagonal PEO cylinder structure in wider volume
range than that of a linear block copolymer. We clarified that the PEO crystallization and
melting temperature is lower than that of bulk PEO chain and that the phase transition
temperature of AZO domain is almost the same as that of AZO homo polymer by DSC
measurements. This means the dynamics of PEO chain is restricted in the cylinder by size
and/or anchor effects. In this study, the dynamics of PEO chain was investigated by quasielastic neutron scattering technique. The figure shows mean square displacements (<u2>)
of PEO114AZO18, PEO114AZO51 and AZO30 as a function of temperature. The <u2> of
PEO114AZO18 and PEO114AZO51 was jumped around 320 K corresponding to the PEO
melting. The comparison with PEO homopolymer will be discussed in the presentation.
[1] S. Asaoka, T. Uekusa, H. Tokimori, M. Komura, T. Iyoda, T. Yamada, and H. Yoshida
Macromolecules, 44, 7645 (2011)
43
Feb. 3-6 , 2013
Poster-PS04
Chain dimension of ring polystyrenes in solutions studied by
SANS
H. Sawaki, Y. Ohta, A. Takano and Y. Matsushita
Department of Applied Chemstry, Nagoya University, JAPAN
Email: atakano@apchem.nagoya-u.ac.jp
Ring polystyrenes (PSs) were synthesized by anionic polymerization technique and
purified with preparative size-exclusion chromatography (SEC). Seven ring PSs with
their weight average molecular weight (Mw) ranging from 17k to 570k were prepared
and they were confirmed to have high purities all over 96% by liquid chromatography at
the chromatographic critical condition (LCCC) analyses. Their radii of gyration (Rgs)
were determined in benzene-d6 as a good solvent and in cyclohexane-d12
or cyclohexane-h12 as theta solvents by small-angle neutron scattering (SANS) or
light scattering (LS). It has been found that Rgs of ring polymers are scaled with Mw as
Rg∝Mw0.61 in a good solvent (Figure 1a) and as Rg∝Mw0.53 in theta solvents (Figure
1b). Moreover it was confirmed that g factors, Rg2(Ring)/Rg2 (Linear), obtained in
theta solvents are meaningfully larger than theoretically predicted values owing to the
topological effect stored in ring molecules.[1]
a
b
Figure 1 Double logarithmical plots of the radii of gyration against molecular weight for
ring (red line) and linear polymers (blue line) (a) in benzene-d6 and (b) in cyclohexaned12/h12.
[1] A.Takano, Y.Ohta, K.Masuoka, K.Matsubara, T.Nakano, A.Hieno, M.Itakura,
K.Takahashi, S.Kinugasa, D.Kawaguchi,Y.Takahashi and Y.Matsushita Macromolecules
2012, 45, 369-373
44
Feb. 3-6 , 2013
Poster-PS05
Chain dimension of ring polystyrenes in bulk studied by SANS
Y. Kobayashi, Y. Ohta, A. Takano and Y. Matsushita
Department of Applied Chemstry, Nagoya University, JAPAN
Email: atakano@apchem.nagoya-u.ac.jp
A series of ring polystyrenes (PSs) were synthesized by anionic polymerization
technique and purified with preparative size-exclusion chromatography (SEC). Four
pair of hydrogenous ring PSs (PS-h8s) and also deuterated ones (PS-d8s) with the
molecular weight (Mw) ranging from 16k to 380k were prepared and they were
confirmed to have high purities all over 95% by liquid chromatography at the
chromatographic critical condition (LCCC) analyses. Their radii of gyration (Rgs) of
ring PS mixtures of PS-h8 and PS-d8 with the same Mw were measured in bulk by
small- angle neutron scattering (SANS). It was found that Rg of ring PSs in bulk is
scaled with Mw as Rg∝Mw0.39 during the molecular weight range (Figure 1). The
result is in good agreement with computer simulations and theoretical predictions.[1]
Figure 1 Double logarithmical plots of the radii of gyration against molecular weight for
ring polymers in bulk.
[1] Takano, et al. Macromolecules to be submitted
45
Feb. 3-6 , 2013
Poster-PS06
Calculation of Space-time Correlation Function on Liquid
Benzene by using MEM
T. Kikuchi, K. Nakajima, S. Ohira-Kawamura and Y. Inamura
Email: tkikuchi@post.j-parc.jp
Dynamic structure factor, S(Q,ω), which can be obtained by neutron scatterings is
defined as a Fourier-transformed function from van Hove's space-time correlation
function, G(r,t), which is a function in real space and time. G(r,t) is important for
elucidation of relaxation phenomena to express the motion of atoms and molecules
directly. However, the calculation of G(r,t) has been hardly performed even though it is
so easy mathematically, because it was difficult to measure both in high resolution and
wide Q-E range. By the progress of the recent neutron sources and spectrometers, the
measurements with wide range and high resolution in Q-E space are becoming easy. We
measured high-resolution S(Q,ω)’s using AMATERAS spectrometer installed at JPARC and calculated G(r,t)’s. We chose benzene and benzene-d6 as the samples, which
were simple molecular liquids. We used the maximum entropy method (MEM) to lower
the bias of truncation errors for the calculation of G(r,t). Figure shows the calculated
G(r,t) of benzene at 279K. Because G(r,t) includes the self-correlation term, the
intensity of G(r,t) is represented as I (r, t ) 4r 2 G(r, t )    .
Fig. Space-time correlation function of liquid benzene at 279 K.
46
Poster-PS07
Moisture effect on Double network polymers using JPARC/TAIKAN(BL15)
T. TominagaA, S. TakataA, J. SuzukiB, T. ShinoharaA, T. OkuA, T. NakataniA, Y. InamuraA, K.
SuzuyaA, K. AizawaA, M.AraiA, T. OtomoA, H. IwaseB, K. OhishiB, T. ItoB, H. KiraB, S. SugiyamaC
A
B
Neutron Science Section, J-PARC Center, Tokai, 319-1195, Japan
Research Center for Neutron Science and Technology, CROSS, Tokai, 319-1106, Japan
C
Research Reactor Institute, Kyoto University, Kumatori, 590-0494, Japan
Email: taiki.tominaga@j-parc.jp
Moisture effect of mechanical properties against dried aqueous polymer network was
experimentally discussed. A freeze-dried Double network hydrogel (DN-gels1) increases
Young’s modulus and fracture stress in range of relative humidity (RH) from 0 to 30%.
When RH exceeds 30%, with increasing RH, elongation of the samples could be
observed. Under the RH between 0 to 80%, the humidity reversibility can be observed.
When RH exceeds 80% (water content is about 17wt %), the water content in the
network abruptly increased and the Young’s modulus abruptly decreased. Focusing on
the behavior of water located onto the polymer chains, we approached thermodynamic
approach (differential scanning calorimeter), spectroscopic approach (Infrared, nuclear
magnetic resonance), and structural approach (wide angles X-ray scattering, and small
angle neutron scattering).
[1] Gong, J. P. Soft Matter 6, 2583−2590 (2012) [2] T. Tominaga, K-I. Sano, J.
Kikuchi, H. Mitomo, K. Ijiro, and Y. Osada ACS Macro Lett. 1, 432−436 (2012)
ACKNOWLEDGEMENT: A part of this work was financially supported by Toyota
Motor Corporation. The authors acknowledge their consistent encouragement and
support.
47
Poster-PH01
Study of direct relations between the spiral spin ordering and electric
polarization in Mn1-xCoxWO4
Young-Sang Song1, Jae-Ho Chung1,*, Sung-Beak Kim2, Jürg Scheffer3, Sae-Hwan Chun4,
Bumsung Lee4, Li Qin Yan4, Kee Hoon Kim4, A. Nogami5, and T. Katsufuji5
1. Department of Physics, Korea Univ., Seoul, 136-713 Rep. of Korea
2. Advancement for College Education Center, Konyang Univ., Chungnam 320-711, Korea`
3. Laboratory for Neutron Scattering, Paul Scherrer Institut, Villigen, Switzerland
4. Department of Physics, Seoul National Univ., Seoul, 151-742 Rep. of Korea
5. Department of Physics, Waseda Univ., Tokyo 169-8555, Japan
Magnetoelectric multiferroics refer to materials that ferroelectricity and
(ferro)magnetic spin orders are simultaneously observed, and often exhibit strong
coupling. Such coupling between (ferro)magnetic and ferroelectric order is known as
magnetoelectric effect. MnWO4 is one of the best studied magnetoelectric multiferroics.
In this material, ferroelectric polarization (P) is observed only in the elliptical spiral
incommensurate antiferromagnetic spin order (AF2 phase, T = 7.6 ~ 12.7 K, the P is
parallel to the b axis), but not in the collinear commensurate (AF1 phase, T < 7.6 K) or
the collinear incommensurate (AF3 phase, T = 12.7 ~ 13.5 K). The major direction of the
ferroelectric polarization on the AF2 phase can be explained based on the spin current
model, i.e. P = Aeij×(Si×Sj).
We investigated the Co doping effect on magnetic spin structures of multiferroic Mn1xCoxWO4 using neutron diffraction experiments. The main results are that the
noncollinear spiral AF2 is stabilized down to the base temperature in replacement of the
AF1 when the Co substitution increases up to x ~ 0.05, and the spiral planes of the AF2
becomes perpendicular to the b axis when x = 0.10 ~ 0.15. This spin-flop transition is
accompanied by the flop of the ferroelectric polarization. For x = 0.10 ~ 0.15, it is
confirmed that the primary orientation of P is along the a axis, not the b axis. For x =
0.20, however, the spiral planes and the main P direction reverts back to the b axis. All
these results indicate that the magnetoelectricity of Mn1-xCoxWO4 can be explained by the
spin current model, and it can be controlled via Co doping.
*Corresponding author e-mail: jaehc@korea.ac.kr
48
Poster-PH02
Heliconical magnetic ordering and field-induced electric polarization in
Zn2Y and Co2Y hexaferrites
Hak Bong Lee, Hun Chang , Young Sang Song , Jae Ho Chung, Sae Hwan Chun A,
Kwang Woo Shin A, Byung-Gu Jeon A,Yi Sheng Chai,A Kee Hoon Kim,A Karel Prokes,B
Slavomir Matas,B Manfred Reehuis,B and Jürg SchefferC
A
Department of Physics, Korea University, Seoul, 136-713 Korea
Department of Physics and Astronomy, Seoul National University, Seoul, 151-742 Korea
B
Helmholtz Zentrum Berlin für Materialien und Energie, Berlin, 14109 Germany
C
Paul Scherrer Institut, Villigen, Switzerland
Email: jaehc@korea.ac.kr
Hexagonal ferrites containing Fe3+ (S = 5/2) ions exhibit robust magnetoelectric
coupling stable near or above room temperature. Hopes are high for device applications
exploiting this novel phenomenon, because their magnetoelectric polarization can be
controlled at relatively small magnetic fields.
In this work, we investigate the magnetic ordering of two related Y-type hexaferrites,
namely Al-doped Zn2Y and Co2Y, that exhibited field-induced magnetoelectric
polarization. Following zero field cooling, we observed incommensurate heliconical
magnetic ordering commonly in the two hexaferrites. Upon application of external field
perpendicular to the hexagonal c axis, however, commensurate transverse ordering was
stabilized in the field range that exhibit magnetoelectric polarization. We argue that the
consistent behaviors of the two compounds can be understood based on two coexisting
and competing anisotropy fields. [1].
[1] Hak Bong Lee et. al, PRB 86 094435 (2012)
49
Poster-PH03
Single crystal neutron diffraction of magnetoelectric Co2Z hexaferrite
H. Chang, H. B. Lee, J. H. Chung,
S. H. ChunA, K. W. ShinA, B. G. JeonA, K. H. Kim A, K. ProkesB, S. MatasB
Department of Physics, Korea University, Seoul, Korea, ADepartment of Physics, Seoul National
University, Seoul, Korea BHelmholtz Zentrum Berlin für Materialien und Energie, Berlin, Germany Email:
jaehc@korea.ac.kr
Over the past decade, several types of hexaferrites have been studied with the prospect
of achieving high-temperature magentoelectric effect. Such effect at room temperature
was finally realized in polycrystalline and single crystalline samples of Co2Z-type
hexaferrites [1,2].
In this work, we investigated the correspondence between the spin ordering and the
electric polarization in the single crystal Ba0.52Sr2.48Co2Fe24O41 under external field.
Neutron diffraction data showed that the spin ordering remained to be commensurate to
the lattice through the field cycling up to 3 T. The overall field dependence of the
magnetic ordering indicated that the transverse conical ordering is directly related to the
electric polarization, which is consistent with other types of magnetoelectric hexaferrites.
Our work demonstrates that the magnetoelectricity of different hexaferrites can be
understood based on the common picture, which involves competing exchange
interactions and coexisting two different anisotropies[3].
[1] Y. Kitagawa et al., Nature Mater. 9, 797 (2010)
[2] S. H. Chun et al., Phys. Rev Lett. 108, 177201 (2012)
[3] H. Chang et al., Phys. Rev B. 85, 064402 (2012)
50
Poster-PH04
Neutron scattering studies in non-centrosymmetric superconductors
CeTSi3 (T = Rh, Ir)
N. Aso, S. SuzukiA , M. TakahashiA , H. MiyanoA , H. YoshizawaA ,
N. KimuraB , H. IidaB , H. AokiB , M. MatsudaC , P. SteffensD and A. HiessE
Faculty of Science, University of the Ryukyus, Okinawa, Japan
A
Neutron Sci. Lab., ISSP, Univ. of Tokyo, Tokai, Japan
B
Dept. of Phys., Graduate School of Sci., Tohoku Univ., Sendai, Japan
C
Oak Ridge National Laboratory, Oak Ridge, TN, USA
D
Institut Laue-Langevin, Grenoble, France
E
European Spallation Source AB, Lund, Sweden
Email: aso@phys.u-ryukyu.ac.jp
Discoveries of non-centrosymmetric (NCS) heavy-fermion (HF) superconductors
CePt3 Si[1], UIr[2], CeRhSi3 [3] and CeIrSi 3 [4] draw strong attention as one of the
most important topics in the strongly correlated electron physics. The crystal structure of
CeTSi3 (T = Rh, Ir) is the BaNiSn3 -type belonging to the space group I4mm (No. 107)
without an inversion center. While both compounds exhibit the antiferromagnetic (AFM)
ordering below TN = 5.0 K and 1.6 K at ambient pressure, TN decreases and the
superconductivity (SC) appears in a wide pressure range by increasing the pressure. We
have been studying CeTSi3 (T = Rh, Ir) mainly by neutron scattering, to elucidate the
correlation between AFM and superconductivity.
(1) To determine the magnetic structure of both compounds, we performed neutron
diffraction experiments using the triple-axis spectrometers GPTAS at JRR-3 and HB-1 at
ORNL, we observed incommensurate Bragg reflections below TN for both compounds
at the propagation vectors of k = (0.215, 0, 0.5) and (0.265, 0, 0.43) for CeRhSi3 [5] and
CeIrSi3 [6], respectively. From the representation analyses, we found that both
compounds exhibit the longitudinal spin-density-wave state (LSDW) with the magnetic
moment polarized to a-axis.
(2) To investigate the nature of the AFM and the SC in these materials, we performed an
inelastic neutron scattering experiment on CeRhSi3 using the triple-axis spectrometer
IN14 (with the FlatCone multianal- yser) at ILL and observed magnetic fluctuations at
low temperatures for the first time. They are broad with the correlation length of
ξ//a−axis ∼ 15 Å but c∗ -independent behavior, indicating the magnetic fluctuation in
CeRhSi3 is the 2-dimentional character confined in the a-b plane, which is quite contrast
to the recent NMR result under SC optimal pressure of 2.7 GPa in CeIrSi3 being the 3dimensional character.[7] In the meeting, we will discuss the details of the above results.
References
[1] E. Bauer et al., Phys. Rev. Lett. 92, 027003 (2004).
[2] T. Akazawa et al., J. Phys. Soc. Jpn. 73, 3129 (2004).
[3] N. Kimura et al., Phys. Rev. Lett. 95, 247004 (2005).
[4] I. Sugitani et al., J. Phys. Soc. Jpn. 75, 043703 (2006).
[5] N. Aso et al., J. Magn. Magn. Mat. 310, 602 (2007)
[6] N. Aso et al., J. Phys. Soc. Jpn. 80, 095004 (2011).
[7] H. Mukuda et al., Phys. Rev. Lett. 100, 107003 (2008).
51
Poster-PH05
Structure of SiO2-GeO2 glasses by J-PARC NOVA
K. Suzuya
J-PARC Center, Japan Atomic Energy Agency, Tokai, Japan
Email: kentaro.suzuya@j-parc.jp
52

Sunday, Feb. 3 Monday, Feb. 4 - J-PARC

Transcription

Similar documents

3.86 MB

New developments for wavelength- shifting fiber (WLSF

Notes 15 - MSU Chemistry

results for neutrons

Neutron Stars

general purpose nuclear irradiation chamber

II - CERN Accelerator School